CTreeCtrl自绘

[weixin_42573988]

我只想自绘树控件的item文字内容，因为需要两行文字。有什么方便的方法吗？

父节点前面的+-保留，并要显示虚线。

[schlafenhamster]

1 每项 高度 加倍
void CMyTree::PreSubclassWindow()
{
// TODO: Add your specialized code here and/or call the base class
GetClientRect(m_cltRect);
SetItemHeight(40);// 2 lines
CTreeCtrl::PreSubclassWindow();
}

2

void CMyTree::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult) 
{
    LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR);  
      
    LPNMTVCUSTOMDRAW lpnmcd = (LPNMTVCUSTOMDRAW) pNMCD;  
    if (lpnmcd ->nmcd.dwDrawStage == CDDS_PREPAINT)  
    {  
        *pResult = CDRF_NOTIFYITEMDRAW;  
        return;  
    }  
    else if (lpnmcd->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)  
    {  
		HTREEITEM hItem=(HTREEITEM) lpnmcd->nmcd.dwItemSpec;
        HDC  hdc = pNMCD->hdc;
		UINT state = GetItemState(hItem,TVIF_STATE);
        CRect rcItem(pNMCD->rc);
		int ind=GetIndent();// =20
		rcItem.left  += ind*lpnmcd->iLevel;
		rcItem.right += ind*lpnmcd->iLevel;   
//draw bt box  
		CRect rc;// h=20
		rc=rcItem;
//		rc.left  +=2;
		rc.right =rc.left+16;
		rc.top   +=2;
		rc.bottom-=2;
		if(state & TVIS_EXPANDED)
			DrawIconEx(hdc,rc.left,rc.top,m_hIcon2,16,16,NULL,(HBRUSH)NULL, DI_NORMAL);
		else
			DrawIconEx(hdc,rc.left,rc.top,m_hIcon1,16,16,NULL,(HBRUSH)NULL, DI_NORMAL);
//draw image
		int nImage,nSelectedImage;
		GetItemImage(hItem, nImage, nSelectedImage);
//
		rc=rcItem;
		rc.left  +=26;
		rc.right =rc.left+16;
		rc.top   +=2;
		rc.bottom-=2;
		HICON ico;
        if (state & TVIS_SELECTED) 
        {     
			::SetBkColor(hdc,RGB(255,0,0));
			ico=((CTreeCtrlDlg*)GetParent())->ImageTreeList.ExtractIcon(nSelectedImage);
        }
		else
		{
			::SetBkColor(hdc,RGB(255,255,255));
			ico=((CTreeCtrlDlg*)GetParent())->ImageTreeList.ExtractIcon(nImage);
		}
//
		DrawIconEx(hdc,rc.left,rc.top,ico,16,16,NULL,(HBRUSH)NULL, DI_NORMAL);
//
		CString strText;  
        strText=GetItemText(hItem);  
//
        rcItem.left  += 50;//| DT_SINGLELINE| DT_VCENTER| DT_SINGLELINE | DT_VCENTER
		DrawText(hdc,strText, strText.GetLength(), &rcItem, DT_LEFT);
		rcItem.top+=20;
		DrawText(hdc,"2nd Line", 8, &rcItem, DT_LEFT);  
        *pResult = CDRF_SKIPDEFAULT;  
        return;  
    }  
//     
    *pResult = CDRF_DODEFAULT;  
    return;
}  

[schlafenhamster]